A belt and a vest are both made for film photographers. They are studded with 35mm cannister sized holders that will hold many rolls of film along with other things such as lenses and accessories. IDK where to get them nowdays, but I have used mine for quite a number of occasions. Well, not as many as I would really like, but they are handy.
They are both similar to the belts and vests worn by hunters to hold extra shells.